摘要
以自制的聚(苯乙烯-b-丙烯腈)(PS-b-PAN)嵌段共聚物为成膜材料,采用呼吸图案法制备了有序多孔薄膜,采用扫描电子显微镜(SEM)对薄膜形貌进行了分析,研究了聚合物浓度、溶剂种类及共聚物结构对薄膜结构的影响.结果表明,薄膜表层为多孔结构,且孔为圆形、以六方阵列形式排列;薄膜表层下面是蜂窝状结构.以三氯甲烷(CHCl3)为溶剂时,在较高浓度下制备的薄膜表层孔间距较大,蜂窝结构尺寸较小,且形成了多层结构.与CHCl3为溶剂时相比,挥发速度较快的二硫化碳(CS2)作溶剂时制备的多孔薄膜有序性较好,薄膜表层孔径和孔间距均较大,蜂窝结构尺寸较小.以没有PAN链段的聚苯乙烯大分子引发剂(PS-Cl)为成膜材料时,制备的薄膜表层没有形成多孔结构,而是形成了窝状结构.同时,通过对薄膜表层晕的研究证明了多孔薄膜表层缺陷是由水滴处于液膜下较深的位置造成的.
Ordered porous films were prepared by the breath figure method based on self-synthetic polystyrene-b-polyacrylonitrile （PS-b-PAN）. Their morphologies were characterized by scanning electron microscopy. The influence of polymer concentration, solvent, and polymer structure on the structures of porous films was investigated. Film surfaces were covered with round hexagonally packed pores, and a honeycomb structure resided under film surfaces. With increasing polymer concentration in the chloroform （CHCI3） solvent, pore spacing increased and the size of honeycomb structure decreased. Multilayer structures were observed at higher concentration. When better volatile carbon disulfide （CS2） was instead used as the solvent, even highly ordered porous films were produced. Pore diameter and pore spacing increased, and the size of the honeycomb structure decreased. When the polystyrene macro-initiator （PS-CI） without PAN blocks was adopted as the film material, nest-like structures instead of pores were formed on the film surface. The halo on the film surface suggests that when water droplets were positioned under the liquid film, defects formed on the film surface.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2013年第5期1107-1114,共8页
Acta Physico-Chimica Sinica
基金
陕西省自然科学基金(2009JZ004)
西北工业大学基础研究基金(JC201158)
西北工业大学研究生创业种子基金(Z2012157)资助项目~~
关键词
聚苯乙烯
嵌段共聚物
呼吸图案法
多孔薄膜
缺陷
蜂窝结构
Polystyrene
Block copolymer
Breath figure method
Porous film
Defect
Honeycomb structure
